18818208 has 108 divisors (see below), whose sum is σ = 56791098. Its totient is φ = 5909760.

The previous prime is 18818207. The next prime is 18818213. The reversal of 18818208 is 80281881.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18766224 + 51984 = 4332^2 + 228^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18818207) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 103878 + ... + 104058.

Almost surely, 2^18818208 is an apocalyptic number.

18818208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18818208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28395549).

18818208 is an abundant number, since it is smaller than the sum of its proper divisors (37972890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18818208 is a wasteful number, since it uses less digits than its factorization.

18818208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The square root of 18818208 is about 4337.9958506204. The cubic root of 18818208 is about 265.9863938619.

Adding to 18818208 its sum of digits (36), we get a square (18818244 = 4338²).

The spelling of 18818208 in words is "eighteen million, eight hundred eighteen thousand, two hundred eight".